Wild Manta Ray Welfare: Threats from Tourism, Fishing, and Plastic Pollution

Manta rays are among the ocean's most charismatic animals, but gill raker fishing, plastic entanglement, and irresponsible tourism cause significant welfare harm to individual animals.

Key Facts

Oceanic manta rays (Mobula birostris) have the largest brains relative to body size of any fish — passing the mirror self-recognition test in some studies
Both oceanic and reef manta species are listed as Vulnerable or Endangered on the IUCN Red List
Manta ray gill rakers are used in traditional Chinese medicine — dried gill rakers fetch high prices despite no proven medical efficacy
Entanglement in fishing gear, including ghost gear, is a leading cause of manta ray injury and death
Plastic debris ingested by manta rays causes internal damage and can be lethal — mantas feed by filtering surface waters where plastic concentrates
Irresponsible dive tourism — chasing, touching, blocking flight paths — causes acute stress and can separate mothers from pups
Manta rays visit cleaning stations predictably, making them vulnerable to both tourism disturbance and targeted fishing
Marine protected areas covering manta ray feeding and cleaning sites have been established in Maldives, Ecuador, and Indonesia

Welfare Considerations

Manta ray welfare is shaped by a combination of deliberate exploitation, incidental harm, and disturbance at ecologically critical sites. Gill raker fishing for Chinese medicine markets causes suffering through the capture process itself — mantas are large, strong animals whose distress during capture is evident — and death. Ghost gear entanglement causes prolonged suffering as animals attempt to free themselves from nets wrapped around their bodies and cephalic fins. Plastic ingestion blocks digestive function and causes slow deterioration. Tourism disturbance at cleaning stations — where mantas gather for parasite removal by cleaner wrasse — disrupts a critical biological function: mantas chased away from cleaning stations carry higher parasite loads, affecting health and welfare. Responsible manta tourism uses established guidelines: approach slowly and passively, do not chase or touch, allow the manta to dictate proximity, and never block a cleaning station. The welfare case for establishing Marine Protected Areas around key manta sites is strong — these protect both individual welfare and population viability.

What You Can Do

Never purchase products containing manta ray gill rakers or traditional medicine derived from rays
Choose responsible manta ray dive operators who follow established wildlife interaction guidelines
Support Marine Protected Area establishment around key manta ray feeding and cleaning sites
Reduce single-use plastic to decrease plastic pollution in surface waters where mantas feed
Support ghost gear clean-up programmes that remove entanglement hazards from manta habitat
Donate to manta ray research and conservation organisations that provide the data underpinning protection policy